| 摘要 |
PURPOSE:To produce the title steel sheet having excellent iron loss by incorporating S, Se, Mn, N, and acid-soluble Al under specified conditions at the time of producing the steel sheet from a silicon steel slab contg. specified amts. of C, Si, and Sn. CONSTITUTION:A silicon steel slab contg., by weight, 0.050-0.120% C, 2.8-4.0% Si, and 0.05-0.25% Sn is heated to a high temp., and hot-rolled. The rolled sheet is annealed at >=920 deg.C for >=30sec prior to final cooling, and then cold-rolled at 81-95% draft into a sheet having 0.05-0.25mm thickness. The sheet is decarburized and annealed, an annealing and separation agent is applied, and finish annealing is carried out to obtain a grain-oriented electrical steel sheet. At this time, <=0.035% S, 0.0005-0.035% Se, where 0.015-0.060% (S+Se), 0.050-0.090% Mn, where Mn=[1.5X(S+Se)]--[4.5X(S+Se)], 0.005-0.0100% N, [(27/14XN+0.0030]--[(27/14XN+0.0150]% acid-soluble Al, the balance Fe, and inevitable impurities are incorporated into the silicon steel slab in addition to the above-mentioned components to produce the steel sheet. |
